reformulating the axis grid for a plot

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Ok, so I have data for a temperature field in a 3d array such that temp(i,j,k) defines the temperature at the coordinates in the i, j, and k directions, but the problem is that the coordinate field is not linear. What i mean is that when i = 1, x = 0, when i = 2, x = .19, when i = 3, x = .76, so on and so fourth. Right now, when I want to take a slice of the data (which is 128x128x128), i can only take a slice in terms of the i value and the coordinate system is set up in terms of the i value, so the points are distributed from 1 to 128, but i need the distributed relative to the function that defines the coordinate axis. Anyone out there know how to do that?